A lipoma is a benign lump of fatty tissue that grows close to the surface of your skin. While they are sometimes classified as benign tumors, lipomas are not cancerous. Lipomas don't discriminate and can appear on the body of a person of any age on any part of the body, but typically show on the back, neck, and shoulders of adults between the ages of 40 and 60. The cause of lipomas is still unknown, but your chances of developing one in your life increase if lipomas have shown up in your family history. If your armpit lump feels soft to the touch and can easily be moved without feeling full of fluid as a cyst would, then it likely is a lipoma.
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